multi-app.c
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上传日期:2018-10-23
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- /*****************************************************************************
- * _ _ ____ _
- * Project ___| | | | _ | |
- * / __| | | | |_) | |
- * | (__| |_| | _ <| |___
- * ___|___/|_| ______|
- *
- * $Id: multi-app.c,v 1.9 2008-05-22 21:20:09 danf Exp $
- *
- * This is an example application source code using the multi interface.
- */
- #include <stdio.h>
- #include <string.h>
- /* somewhat unix-specific */
- #include <sys/time.h>
- #include <unistd.h>
- /* curl stuff */
- #include <curl/curl.h>
- /*
- * Download a HTTP file and upload an FTP file simultaneously.
- */
- #define HANDLECOUNT 2 /* Number of simultaneous transfers */
- #define HTTP_HANDLE 0 /* Index for the HTTP transfer */
- #define FTP_HANDLE 1 /* Index for the FTP transfer */
- int main(int argc, char **argv)
- {
- CURL *handles[HANDLECOUNT];
- CURLM *multi_handle;
- int still_running; /* keep number of running handles */
- int i;
- CURLMsg *msg; /* for picking up messages with the transfer status */
- int msgs_left; /* how many messages are left */
- /* Allocate one CURL handle per transfer */
- for (i=0; i<HANDLECOUNT; i++)
- handles[i] = curl_easy_init();
- /* set the options (I left out a few, you'll get the point anyway) */
- curl_easy_setopt(handles[HTTP_HANDLE], CURLOPT_URL, "http://website.com");
- curl_easy_setopt(handles[FTP_HANDLE], CURLOPT_URL, "ftp://ftpsite.com");
- curl_easy_setopt(handles[FTP_HANDLE], CURLOPT_UPLOAD, 1L);
- /* init a multi stack */
- multi_handle = curl_multi_init();
- /* add the individual transfers */
- for (i=0; i<HANDLECOUNT; i++)
- curl_multi_add_handle(multi_handle, handles[i]);
- /* we start some action by calling perform right away */
- while(CURLM_CALL_MULTI_PERFORM ==
- curl_multi_perform(multi_handle, &still_running));
- while(still_running) {
- struct timeval timeout;
- int rc; /* select() return code */
- fd_set fdread;
- fd_set fdwrite;
- fd_set fdexcep;
- int maxfd;
- FD_ZERO(&fdread);
- FD_ZERO(&fdwrite);
- FD_ZERO(&fdexcep);
- /* set a suitable timeout to play around with */
- timeout.tv_sec = 1;
- timeout.tv_usec = 0;
- /* get file descriptors from the transfers */
- curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
- /* In a real-world program you OF COURSE check the return code of the
- function calls, *and* you make sure that maxfd is bigger than -1 so
- that the call to select() below makes sense! */
- rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
- switch(rc) {
- case -1:
- /* select error */
- break;
- case 0:
- /* timeout, do something else */
- break;
- default:
- /* one or more of curl's file descriptors say there's data to read
- or write */
- while(CURLM_CALL_MULTI_PERFORM ==
- curl_multi_perform(multi_handle, &still_running));
- break;
- }
- }
- /* See how the transfers went */
- while ((msg = curl_multi_info_read(multi_handle, &msgs_left))) {
- if (msg->msg == CURLMSG_DONE) {
- int idx, found = 0;
- /* Find out which handle this message is about */
- for (idx=0; (!found && (idx<HANDLECOUNT)); idx++) found = (msg->easy_handle == handles[idx]);
- switch (idx) {
- case HTTP_HANDLE:
- printf("HTTP transfer completed with status %dn", msg->data.result);
- break;
- case FTP_HANDLE:
- printf("FTP transfer completed with status %dn", msg->data.result);
- break;
- }
- }
- }
- curl_multi_cleanup(multi_handle);
- /* Free the CURL handles */
- for (i=0; i<HANDLECOUNT; i++)
- curl_easy_cleanup(handles[i]);
- return 0;
- }